Update README.md

Author: tajiknomi

README.md

@@ -33,7 +33,8 @@ or you can use your own REST/json http server.
 
 Download the [clientHTTP_linux binaries]() from release section use the below command to communicate with the server.
 ```
-./clientHTTP <URL/IP>
+chmod +x clienthttp
+./clienthttp <URL/IP>
 ```
 By default, the app will send hearbeat/alive signal every 1 sec in order to inform the server at *<URL/IP>* that it is alive and will collect the command/instruction from server (*if the server have any instruction/command/data for the client*). You can modify this interval time in main.cpp (variable --> *heartbeatTimerInSecs*).